Physics – Optics
Scientific paper
2007-11-27
Physics
Optics
12 pages, 8 figures, to be pubblished in Photonics and Nanostructures - Fundamentals and Applications
Scientific paper
10.1016/j.photonics.2007.12.001
We present a study of the lensing properties of two-dimensional (2-D) photonic quasicrystal (PQC) slabs made of dielectric cylinders arranged according to a 12-fold-symmetric square-triangle aperiodic tiling. Our full-wave numerical analysis confirms the results recently emerged in the technical literature and, in particular, the possibility of achieving focusing effects within several frequency regions. However, contrary to the original interpretation, such focusing effects turn out to be critically associated to local symmetry points in the PQC slab, and strongly dependent on its thickness and termination. Nevertheless, our study reveals the presence of some peculiar properties, like the ability to focus the light even for slabs with a reduced lateral width, or beaming effects, which render PQC slabs potentially interesting and worth of deeper investigation. Key words: Photonic quasicrystals; negative refraction; superlensing.
Andreone Antonello
Castaldi Giuseppe
Galdi Vincenzo
Gennaro Emiliano Di
Miletto Carlo
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